March 2026
The 60-fold mismatch
Air conditioning, as currently deployed across India, is a room-scale intervention applied to a person-scale problem.
A resting adult generates approximately 80W of metabolic heat. A 1.5-ton split AC unit removes 5,000W of heat from an enclosed space. The mismatch is roughly 60-fold. This is not an engineering indictment of AC — it is a systems design observation. When the goal is a habitable thermal environment for one person, the appropriate scale of intervention is the person, not the building.
We cool rooms because that’s what the available technology does. Not because that’s what the problem requires.
Cool the person. Not the space.
The stillsuit principle
Frank Herbert described it in 1965: the Fremen stillsuit — a full-body garment reclaiming 99.7% of body moisture and regulating core temperature within 1°C of optimal. The Dune Part Three trailer dropped today. Herbert’s engineering isn’t available at that specification yet, but the design philosophy is available right now: meet the body’s thermal requirements at the scale of the body.
This isn’t science fiction. It’s thermodynamics. And the thermodynamics are on our side.
The present moment
India recorded its highest nighttime temperatures in observed history during summer 2024. AC penetration stands at approximately 8% of households. Grid load-shedding during peak heat events removes even this limited coverage intermittently. The conditions that make personal cooling a philosophical preference in 2025 will make it a practical necessity by 2030.
Cool the person. Not the space. Cool the worker. Not the warehouse. Cool the student. Not the school. Cool the sleeper. Not the bedroom. Cool the grandma. Not the living room. Cool the driver. Not the atmosphere.
Heat without recovery: the physiological case
Three arguments. Each independent. Each sufficient.
Argument 1 — the nighttime recovery window
The human body requires approximately 4–6 hours at ambient temperatures below 35°C to repair cellular heat damage accumulated during daytime exposure. When nighttime minimum temperatures remain above 30°C — a condition now regularly observed across the Indo-Gangetic plain, coastal metropolitan areas, and the Deccan plateau — this recovery window is absent.
Here is the fact that surprises people: heat deaths peak between 2am and 5am, not at the afternoon maximum. The mechanism is cumulative. Each day begins with incomplete repair from the previous day. By day three or four of a heat wave, the deficit is lethal.
This is the primary physiological argument for prioritising nighttime personal cooling above all other interventions.
Nighttime minimum temperatures across Indian cities have been rising steadily toward — and past — the 30°C threshold below which the body can repair heat damage during sleep.
Argument 2 — distributional exposure
AC penetration in India is approximately 8% of households, concentrated in urban upper-income demographics. The remaining population relies on:
- Ceiling fans — assist evaporative cooling but ineffective above ~35°C wet-bulb temperature
- Evaporative coolers — ineffective above 60% relative humidity
- Passive ventilation — increasingly inadequate
The populations with the greatest occupational heat exposure — agricultural workers, construction labour, delivery and transport workers, domestic workers, informal manufacturing — are also those with the least access to cooling infrastructure. Their work cannot be rescheduled to cooler hours. It is time-constrained by contracts, markets, or daylight.
Cool the worker. Not the warehouse.
Argument 3 — the grid constraint
Air conditioning is currently the fastest-growing electricity demand category in India. This creates a reinforcing feedback loop:
- Elevated temperatures → increased AC use
- Increased AC use → increased grid load
- Increased grid load → increased probability of load-shedding during peak heat
- Load-shedding → removal of cooling from households that have it
- Go to 1.
Centralised, grid-dependent cooling cannot scale fast enough to address projected demand over the next decade. Distributed, low-wattage personal cooling systems — compatible with rooftop solar and battery storage — represent an architecturally distinct response to this constraint.
| Parameter | 1.5-ton split AC | Personal cooler (60W) |
|---|---|---|
| Power draw | 1,500W | 60W |
| 8 hours/night consumption | 12 kWh | 0.48 kWh |
| Daily cost at ₹8/unit | ₹96 | ₹3.84 |
| Monthly cost | ₹2,880 | ₹115 |
| Solar-battery compatible? | No (at household scale) | Yes |
25× less energy. 25× less cost. Same person cooled.
The physics of personal cooling
Personal cooling is not a compromise relative to whole-room AC. It is thermodynamically appropriate to the actual task.
Heat budget
| Activity | Metabolic heat output |
|---|---|
| Resting / sleeping | 70–80W |
| Light desk work | 90–120W |
| Moderate physical labour | 200–350W |
These are the removal targets. A well-designed personal cooling system addressing 150–250W of heat removal is sufficient to maintain skin surface temperature below 33°C even at 40°C ambient, provided the system addresses the correct heat transfer pathways.
The four heat transfer pathways
Your body loses heat through four mechanisms. Understanding them is the key to understanding why personal cooling works.
1. Radiation (~40% of heat loss at rest)
The body emits infrared radiation to surrounding surfaces. When ambient surfaces are hotter than skin — common in poorly insulated structures with tin roofs in summer — this pathway reverses: the body gains heat radiatively. Reflective barriers and cooled radiant surfaces address this.
2. Convection (~30%)
Moving air over skin carries heat away. A gentle airflow of 0.5–1.0 m/s can remove 30–50W from exposed skin depending on temperature differential. Above approximately 35°C air temperature, the benefit diminishes as incoming air itself carries heat.
3. Evaporation (~25%)
Sweat evaporation is highly effective at low humidity. At relative humidity above 60–70%, evaporative capacity falls sharply and this pathway becomes unreliable. Any personal cooling design for humid climates must therefore prioritise conduction and convection over evaporation.
4. Conduction (~5% at rest, but highly augmentable)
Direct contact with a cooled surface can remove heat far more efficiently than air convection — water has approximately 25× the thermal conductivity of air. Cooled mattress pads, seat surfaces, and foot plates exploit this pathway and are effective regardless of ambient humidity.
Thermal radiator sites
The body is thermally non-uniform. The feet, hands, face, and neck are primary heat dissipation sites — areas with high surface-area-to-volume ratios and superficial vasculature that can be dilated to dump heat.
Cooling these sites produces a disproportionate whole-body effect. A 3°C reduction in foot surface temperature produces a perceived whole-body cooling response approximately twice that magnitude as measured by thermal comfort indices.
Any personal cooling design should prioritise coverage of these sites over the thermally less responsive torso musculature.
Design principle: cool the extremities first. The neck, the feet, the wrists. The torso can wait.
Context: sleeping
Cool the sleeper. Not the bedroom.
Why sleep is the highest priority
Nighttime thermal recovery is the single most important intervention. The person who sleeps cool can survive a hot day. The person who sleeps hot accumulates damage that compounds daily.
Who this addresses: Residents without AC in structures where nighttime temperatures remain above 30°C. Informal housing, lower-middle-income urban households, migrant worker accommodation, student hostels, rural homes across the northern plains and coastal regions. Also: households with AC that face load-shedding during peak summer nights.
The blanket-as-enclosure insight
A blanket or light sheet, typically discarded in summer, can be reconceived as a passive thermal enclosure. When cool, dehumidified air is introduced beneath it and warm, humid exhaled air is extracted, the bedding layer becomes an insulating barrier that maintains a localised cool microclimate around the sleeper.
The physics that make a blanket oppressive in summer — its resistance to heat exchange — become an asset when the enclosed volume is being actively cooled.
Tiered solutions
Tier 1 — zero power (up to ~35°C ambient, low humidity only)
- Wet cotton mattress cover with ceiling fan airflow
- Phase-change material (PCM) cooling mat: pre-frozen inserts providing 3–4 hours of conductive cooling
- Cooling pillow with gel insert
- Radiant barrier installed above sleeping area (reflective foil, reduces solar heat gain through roof)
- Cost: ₹200–1,500
- Limitation: fails above ~60% RH; limited duration for PCM inserts
Tier 2 — low power, 20–50W (up to ~40°C ambient, any humidity)
- Under-blanket air circulation unit
- Bedside unit (~25×20×15cm): Peltier cooler element, dehumidifier, centrifugal fan
- Flexible duct (40–50mm diameter) routed beneath a light blanket from the foot of the bed
- Cool, dehumidified air distributes through the enclosed sleep zone; warm, humid air exits at the open head end
- Simple thermostat control; no user interaction required during sleep
- Battery-compatible: 8 hours at 40W = 320Wh, within range of a 500Wh solar battery pack
- Cost: ₹3,000–6,000 (target manufacturing BOM: ₹1,800–2,800)
Tier 3 — medium power, 60–80W (any ambient, any humidity)
- Water-cooled mattress pad system (comparable in principle to ChiliPad/Eight Sleep, designed for India-viable cost points)
- Bedside unit circulates water chilled to 18–22°C through a pad with embedded microchannels
- Maintains mattress surface temperature independent of ambient
- Effective for two persons with dual-zone control
- Cost: ₹8,000–15,000 at India-viable pricing
- Requires mains or large battery; not suited to solar-only off-grid at current storage costs
Tier 4 — personal sleep enclosure, 80–120W (extreme ambient)
- Insulated sleeping enclosure (fabric and rigid frame, similar in concept to a tent liner)
- Integrated active cooling unit; battery-powered, solar-chargeable
- Designed for informal housing with no thermal mass, tin roofs, extreme ambient heat
- Creates a cooled microclimate independent of the room
- The highest humanitarian impact design — and the furthest from current commercial availability
- Cost target: ₹12,000–20,000
Context: desk work
Cool the worker. Not the office.
The productivity argument
Cognitive performance — decision quality, reaction time, reading comprehension, sustained attention — declines measurably above 30°C ambient. Studies in occupational health literature document productivity losses of 2–4% per degree Celsius above 25°C for sedentary knowledge work.
For a WFH worker in an uncooled room at 38°C, this represents a 20–50% reduction in effective cognitive output. Personal desk cooling is therefore an economic intervention as well as a comfort intervention.
Who this addresses: WFH professionals, students studying at home, small office workers in buildings with inadequate HVAC, call centre workers, data entry workers, urban informal office settings.
The modular desk cooling stack
A single compact desk unit (~30×20×15cm) with multiple output ports addresses several heat dissipation sites simultaneously. No single configuration is prescribed — the system is modular, with each output purchasable independently.
The desk unit:
| Specification | Detail |
|---|---|
| Cooling method | Peltier cooler or small vapour-compression unit |
| Features | Dehumidifier element, centrifugal fan, variable speed |
| Output ports | One 22mm air port, one optional 6mm liquid loop port |
| Sensors | Wireless skin temperature sensor clip |
| Controls | Simple PID thermostat + manual override dial |
| Power draw | 50–80W (all outputs active) |
| Target cost | ₹6,000–10,000 |
Output 1 — cooling vest (₹1,500–2,500)
Lightweight mesh vest with internal air channel network sewn into chest and back panels. Single 22mm inlet port at waist; air distributes upward, exits at collar and armholes. No electronics in the vest — purely passive air distribution. Connected via 1.5m flexible corrugated hose with swivel joint and quick-disconnect coupler.
Design note: the vest should integrate with normal workwear aesthetically — not resemble protective equipment.
Output 2 — foot cooling box (₹800–5,000)
Insulated enclosure (~40×30×18cm) with open front aperture for feet/ankles. Inner lining: anodised aluminium conductive plate on floor surface, XPS foam insulation on walls (30mm). Air inlet from desk unit duct; passive rear vent for warm exhaust. Optional liquid-cooled plate variant for higher conductive performance.
Exploits the foot’s role as primary heat dissipation site. Effectiveness disproportionate to size.
Output 3 — neck/wrist cooling band (₹500–800)
Soft silicone band with internal microchannel. Cooled water from desk unit liquid loop. Targets carotid artery (neck) or radial artery (wrist) — cools blood before systemic circulation. Perceptually high-impact intervention for modest thermal load.
The purchasing model: A student buys the foot box only (₹800). A professional adds the vest. A person with a heat-sensitive medical condition adds the neck band. The desk unit serves all three simultaneously. No single prescribed configuration.
Context: field and outdoor workers
Cool the driver. Not the atmosphere.
Risk profile
Construction workers. Agricultural labourers. Delivery riders. Auto-rickshaw and goods vehicle drivers. MNREGA workers. Street vendors. Sanitation workers.
Direct solar radiation exposure. Physically demanding work generating 200–350W metabolic heat. No shelter available during work hours. Heat stroke risk is acute; recovery from a heat stroke event requires 1–3 weeks of rest, representing significant income loss for daily wage workers.
Constraint profile
| Constraint | Requirement |
|---|---|
| Power | None at work site; battery (recharged overnight) or entirely passive |
| Mobility | Full freedom of movement; no impedance to arm or leg motion |
| Durability | IP65 minimum for electronics; wash-resistant fabric; dust and sweat tolerant |
| Social acceptability | Must integrate with existing workwear; not appear medical or unusual |
| Individual cost ceiling | ₹2,000–3,000 (employer/government provision viable at higher points) |
Solution A — reflective workwear (zero power, foundation layer)
- Outer fabric with radiant barrier properties (aluminised or high-reflectance polyester)
- Blocks 60–70% of direct solar radiation
- Combined with moisture-wicking inner layer for evaporative assist
- Net effect equivalent to approximately 3–4°C ambient temperature reduction in full sun
- Should be framed as mandatory safety equipment analogous to hard hats; not optional
- Cost: ₹400–800 per garment
Solution B — evaporative neck/head wrap (zero power, re-activatable)
- Polymer crystal neck wrap activated by wetting; maintains evaporative cooling for 1–2 hours
- Re-activates by re-wetting; no recharge required
- Targets the carotid artery and posterior neck — highest thermal impact per gram of any wearable cooling intervention
- Most accessible intervention at scale; price point allows universal provision
- Cost: ₹150–300
- Effective only below ~65% RH; fails in coastal humid conditions during monsoon
Solution C — PCM vest (passive, 2–4 hour duration)
- Vest with integrated phase-change material insert pockets (typically n-octadecane or similar, melt point 28°C)
- Each set of inserts provides 2–4 hours of cooling at 40°C ambient
- Inserts recharged (re-frozen) overnight at home, dormitory, or charging point
- No power at work site
- Cost: ₹1,500–2,500 for vest; ₹150–300 per insert set (reusable, 200–500 cycle life)
- Distribution model: see the PCM exchange network section below
Solution D — active battery-powered cooling vest (4–6 hour duration)
- Peltier-based vest with integrated battery (worn at belt or in rear vest pocket)
- Circulates cooled air or liquid through torso channels
- Battery: 10,000–15,000mAh at 5V/12V; recharges overnight from grid or small solar panel
- Runtime: 4–6 hours at 25W draw
- Appropriate for heat-critical occupational roles: road workers, foundry adjacent labour, daytime vehicle operators
- Cost: ₹4,000–7,000
Context: factory and indoor labour
Cool the seamstress. Not the sweatshop.
Environment profile
Textile mills. Garment factories. Small manufacturing units. Brick kilns. Commercial kitchens. Food processing facilities. Warehouses. Ambient temperatures frequently exceed outdoor temperatures by 5–10°C due to machinery heat load and poor ventilation. Workers are typically stationary or semi-stationary at a workstation. Mains power is available at the employer’s cost.
The employer economics
Personal cooling at each workstation is a productivity and occupational health investment.
| Approach | Power load (30 stations) | Capital cost |
|---|---|---|
| Whole-floor industrial AC | 15–25 kW | High |
| Personal cooler per station | 1.5–2.4 kW | 3–5× lower |
At 50–80W per station across 30 stations, the total load is 1.5–2.4 kW — compared to 15–25 kW for whole-floor industrial air conditioning.
Workstation personal cooler
Compact unit at each workstation providing directional cool airflow at face/neck level and optional foot cooling surface. 50–80W per unit; mains powered. Cost: ₹4,000–8,000 per workstation.
Tethered cooling vest (mains)
Vest connected to a wall-mounted unit via flexible hose. No battery required. Higher cooling capacity than battery variant due to continuous power. Appropriate for workers with defined mobility radius (assembly line, machine operator). Cost: ₹3,000–6,000 per worker.
Mandatory cooled recovery space
A well-insulated room at 24–26°C where workers spend 10–15 minutes per work hour. Evidence from occupational health literature shows brief cool recovery periods reduce cumulative heat stress markers by 40–60% compared to continuous exposure. Minimum viable specification: insulated space, split AC, sufficient capacity for 10% of workforce simultaneously.
Radiant heat shielding (foundry, kiln, kitchen)
Reflective apron and arm guards for workers proximate to high-temperature radiant sources. Required in addition to, not instead of, personal cooling. Cost: ₹600–1,500 per worker.
Context: vulnerable populations at home
Cool the grandma. Not the living room.
Risk concentration
Heat mortality is heavily concentrated in populations over 65 and those with cardiovascular, respiratory, or metabolic comorbidities. These individuals are typically at home during peak heat hours, often alone, and may have reduced mobility. They cannot reliably self-assess heat stress and cannot seek cooler environments without assistance.
Design requirements
| Requirement | Specification |
|---|---|
| Operation | Passive and automatic — no user initiation, adjustment, or monitoring |
| Safety | Low or no trip hazard — no floor-level hoses or cables |
| Noise | Below 35 dB operating noise |
| Aesthetics | Non-clinical appearance; domestic, not medical |
| Monitoring | Low-cost skin temperature monitoring with family notification if threshold exceeded |
Cooled seating surface
Cooled seat cushion and back support with conductive cooling elements. Mains-powered unit integrated into or beside the chair. Works by conduction — no airflow, no noise, no hose navigation required. Cost: ₹3,000–6,000.
Foot cooling mat
Flat cooled mat placed on the floor; person rests bare feet on it. Standalone Peltier-based unit with no external hose connections. No enclosure — cannot be tripped on; zero adjustment required. Cost: ₹1,500–3,000.
Neck cooling band
Phase-change polymer band (passive, re-wettable) or circulating water band (active, connects to small bedside unit). Cost: ₹150–300 (passive); ₹500–800 (active).
Context: children studying
Cool the student. Not the school.
The learning equity argument
Cognitive performance in children — reading comprehension, arithmetic accuracy, sustained attention — declines measurably above 28°C ambient. Children from higher-income households study in air-conditioned rooms. Children from lower-income households study in rooms that routinely reach 35–40°C by afternoon in Indian summers.
The thermal gap compounds the resource gap.
Classroom economics
| Approach | Power requirement | Solar compatible? |
|---|---|---|
| Whole-room AC (3–5 ton unit) | 3,500–5,800W | No (insufficient rooftop) |
| Personal desk cooler × 30 students | ~1,050W (30 × 35W) | Yes (2–3 kW rooftop array) |
A 2–3 kW rooftop solar array — insufficient to run whole-room AC — is sufficient to run personal cooling for every child during school hours. The capital cost differential for personal desk cooling vs whole-room AC is approximately 3–4× lower.
Personal study cooler
- Compact unit at study table: directional cool airflow at face/neck level, foot cooling surface beneath the table
- Child-safe design: no exposed moving parts, auto-shutoff at tilt, maximum surface temperature limits
- Quiet: below 35 dB
- 30–40W per unit
- Cost: ₹2,500–4,000
Classroom deployment
- 30 units per classroom, employer-provided
- Total load: ~1,050W; compatible with 2–3 kW rooftop solar
- Per-student annualised cost significantly below whole-room AC
- Funding frame: learning equity intervention rather than infrastructure spend
The PCM insert exchange network
The principal operational barrier to PCM-based cooling adoption at scale is the need to refreeze inserts daily. The solution is not new infrastructure — it is activation of existing cold-chain assets.
The operational constraint
Phase-change material cooling vests and inserts are effective and low-cost but require daily recharging (re-freezing) at approximately -5°C to -15°C. A household with a functional refrigerator freezer can manage this independently. The target demographic — daily wage outdoor workers, informal housing residents, low-income households — often lacks reliable refrigeration.
The retail exchange model
India’s retail infrastructure is uniquely suited to this. The key insight: a transaction generating ₹5–15 net margin that brings a customer into a shop has demonstrable cross-sell value. India’s retail economy runs on very thin margins over very high transaction volumes. Retailers will stock and manage insert exchange if the footfall is reliable.
The network scales with adoption rather than preceding it.
Medical stores (pharmacies)
Already operate refrigerators for insulin, vaccines, and temperature-sensitive medications. A designated insert exchange section requires one additional shelf. Approximately 1.2 million registered pharmacies in India; density is adequate for neighbourhood-scale coverage.
Ice cream retail outlets and cold drink shops
Already operate commercial freezers at the required temperature range (-10°C to -18°C). Customer footfall is highest during peak summer — precisely when insert recharging demand is highest. The transaction is familiar (analogous to returning a bottle for refill or deposit recovery).
Petrol pumps
High footfall from the target demographic (auto-rickshaw drivers, delivery riders, truck operators). Many already have cold drink refrigerators on-site. Rural petrol pumps are frequently the highest-footfall commercial point in small towns.
Kirana stores and general retailers
Any store with a cold drink cooler can participate at low volume. Even a 5–10 insert set capacity per store is sufficient for neighbourhood-level daily exchange at low adoption rates.
Transaction model
- User drops off a depleted insert set, collects a pre-frozen replacement set
- Exchange fee: ₹5–15 per set (covering electricity cost of freezing + retailer margin)
- Small refundable deposit on the insert set (₹200–500) manages inventory loss
- Critical requirement: insert standardisation across manufacturers — a single standard form factor enables inter-retailer exchange, eliminates brand lock-in, prevents network fragmentation
The standardisation imperative
The insert exchange model is contingent on a standardised insert form factor across manufacturers. This is an industry coordination problem, not an engineering problem. A standard insert geometry, thermal capacity, and safety specification would enable a genuine multi-brand ecosystem. Without standardisation, each manufacturer’s insert is incompatible with competitors’ vests, eliminating the network effect that makes distributed exchange economically viable.
The solution matrix
| Context | Recommended approach | Power draw | Cost range | Works above 40°C? |
|---|---|---|---|---|
| Sleeping | Under-blanket air circulation (tier 2) | 20–50W | ₹3,000–6,000 | Yes |
| Sleeping (high perf.) | Water-cooled mattress pad (tier 3) | 60–80W | ₹8,000–15,000 | Yes |
| Desk work | Desk unit + vest + foot box (modular) | 50–80W | ₹8,000–14,000 | Yes |
| Outdoor / field (passive) | PCM vest + neck wrap + reflective wear | 0W | ₹1,500–3,000 | Partial (2–4hr) |
| Outdoor / field (active) | Battery-powered cooling vest | 15–25W | ₹4,000–7,000 | Yes (4–6hr) |
| Factory / indoor labour | Workstation cooler or tethered vest | 50–80W | ₹4,000–8,000 | Yes |
| Elderly / low-mobility | Cooled seating + foot mat + neck band | 20–40W | ₹2,000–5,000 | Yes |
| Children studying | Personal study cooler | 30–40W | ₹2,500–4,000 | Yes |
Energy sovereignty and the domestic energy stack
A 300W rooftop solar system with a 1 kWh battery — a realistic and increasingly affordable configuration — can sustain the following daily load:
| Load | Power × Time | Source |
|---|---|---|
| Induction cooking | 1,000W × 1.5 hours = 1,500 Wh | Daytime solar (no battery) |
| Personal sleeping cooler | 50W × 8 hours = 400 Wh | Battery, overnight |
| Phone + LED lighting | — = 50 Wh | Battery |
| Total overnight battery draw | ~450 Wh | Within 1 kWh capacity |
This represents near-complete household energy sovereignty for cooking and nighttime cooling from a system costing ₹25,000–40,000 at current pricing, declining.
The same logic that applies to LPG substitution via induction cooking applies to grid AC substitution via personal cooling. Grid instability during peak summer heat creates equivalent urgency.
What needs to happen
Five things that would accelerate this from idea to ecosystem.
1. Energy efficiency ratings for personal cooling
Whole-room ACs have star ratings. Personal coolers don’t. An efficiency rating framework for personal cooling devices — PCM vests, Peltier coolers, water-cooled pads — would let consumers compare products and push manufacturers to compete on efficiency rather than just price. This is a standards problem, not a technology problem.
2. Heat protection as standard PPE
Construction sites require hard hats and safety boots. There is no equivalent requirement for heat protection. Reflective workwear and evaporative cooling should be treated as mandatory safety equipment above defined heat thresholds — the same way we treat any other occupational hazard.
3. Standardised PCM insert form factor
The entire PCM exchange network depends on this. If every manufacturer uses a different insert shape, the distributed recharging model collapses. We need a single standard insert geometry, thermal capacity spec, and safety requirement — so any insert works with any vest and any exchange point. This is the single highest-leverage intervention for the outdoor worker use case.
4. Personal cooling in schools instead of whole-room AC
Per-classroom cost for personal desk cooling is 3–4× lower than whole-room AC. It’s compatible with existing rooftop solar installations. The funding frame should be learning equity, not infrastructure. This is a cheaper, more scalable path to cooled classrooms than the current approach.
5. Building wiring for personal cooling
New residential construction should include power points at bed and desk positions designed for personal cooling systems. The marginal cost at construction time is near zero. Retrofitting is expensive. This is an infrastructure compatibility decision that gets harder to make later.
What you can do
Share this page. The argument is the intervention. The more people who understand that personal cooling is a real, affordable, and scalable alternative to whole-room AC, the faster the market response will follow.
Build from the specifications. Every solution described in this article is specified at a level of detail sufficient to begin engineering prototyping. The specifications are not patented. They are not proprietary. They are published here precisely so that anyone can build them.
Start a company. The market is 500 million people who need cooling and can’t afford AC. The unit economics work. The physics work. Someone needs to build this.
Cool the person. Not the space.
This article is part of the energy sovereignty series on prasannais.com. The companion piece on India’s cooking energy crisis and the case for universal induction is here.
Data sources and citations for all claims in this article will be published as an appendix. If you are a researcher with access to relevant data, get in touch.